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Officials released a description of the girl Friday, saying she is about 4 years old with brown eyes and brown hair that was about 14 inches long.

They said the girl was about 3½ feet tall and weighed just over 30 pounds, which was normal for her height. Her ethnicity isn't yet clear.

The girl's identity and how she died have not yet been determined. Investigators are reviewing reports of missing children and have notified police across the country.

Deer Island is part of the Boston Harbor Islands National Recreation Area and connects to the town of Winthrop. The island is home to two wind turbines and a sewage treatment plant that serves more than 40 communities in the Boston area.